单项选择题
A.谐波减速机B.行星减速机C.RV减速机D.摆线针轮减速机
A.充电锂电池B.民用电池C.铅蓄电池D.工业电池
A.Jig masteringB.Mastering at the zero-degree positionsC.Single axis masteringD.Quick mastering